I’d think that a Shliach Tzibur (including a Baal Koreh) is deserving of an honorific.
I would disagree.
Even if you want to argue that I should be addressed as “Rabbi” ex-officio* (as, for example, a grade school Rebbe would be called Rabbi even if he doesn’t have semicha), that would only apply to the members of my shul. It would not apply to anyone else.
The Wolf
* A position I disagree with as well.